Need page refresh after executing Attributes.Add()

Question

We have one ASP.net page. on page we have <a> tag .

On page load we are adding "href" link to <a> tag as below

 

lnk.Attributes.add("href","google.com");

 

Problem :

 

But in testing we found it works properly some time. But some time we href link dont work first time if we refresh page then it works properly.

 

This issue intermittenently happening.  

 

Please guide if you have faced / resolevd this type of issue.